Röhrdanz Michael, Rebling Tammo, Ohlert Jan, Jasper Jan, Greve Thomas, Buchwald Rainer, von Frieling Petra, Wark Michael
Institute of Biology and Environmental Science, Carl von Ossietzky University of Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany.
Department of Engineering Sciences and Computer Science, University of Applied Sciences Osnabrück, Albrechtstr. 30, 49076, Osnabrück, Germany.
J Environ Manage. 2016 May 15;173:72-8. doi: 10.1016/j.jenvman.2016.03.006. Epub 2016 Mar 11.
Besides pyrolysis the technology of hydrothermal carbonization (HTC) is tested to produce hydrochars for soil improvement. The chemical and physical properties of the hydrochars mainly depend on the feedstock and the process parameters reaction time and process temperature. Systematic investigations on the influences of these process parameters on soil properties of hydrochars like water holding capacity (WHC) and cation exchange capacity (CEC) are missing. In this study, a rush-rich biomass was carbonized within defined HTC process conditions under variation of reaction time and process temperature to produce hydrochars. Analysis of WHC, CEC, the elemental composition and Fourier-transform infrared spectroscopy (FT-IR) were performed to evaluate the influence of HTC process conditions on the pedological hydrochar properties. The results indicated that at increasing reaction severity (reaction time and process temperature) WHC and CEC decreased as well as the elemental O/C ratio. The decrease of WHC and CEC is based on the decrease of the hydrochar surface polarity. However, even the lowest WHC and CEC of investigated hydrochars still exceeded those of pure quartz sand by factors of 5-10. An application of hydrochars produced at severe HTC conditions could improve WHC and CEC of sandy soils. This has to be investigated in further studies.
除热解外，还对水热碳化（HTC）技术进行了测试，以生产用于土壤改良的水炭。水炭的化学和物理性质主要取决于原料以及反应时间和工艺温度等工艺参数。目前尚缺乏关于这些工艺参数对水炭土壤性质（如水持量（WHC）和阳离子交换容量（CEC））影响的系统研究。在本研究中，在限定的HTC工艺条件下，通过改变反应时间和工艺温度，对富含灯心草的生物质进行碳化以生产水炭。通过分析WHC、CEC、元素组成和傅里叶变换红外光谱（FT-IR）来评估HTC工艺条件对土壤学水炭性质的影响。结果表明，随着反应强度（反应时间和工艺温度）的增加，WHC、CEC以及元素O/C比均下降。WHC和CEC的下降是基于水炭表面极性的降低。然而，即使所研究水炭中最低的WHC和CEC仍比纯石英砂高出5至10倍。在严苛的HTC条件下生产的水炭的应用可以改善砂土的WHC和CEC。这有待在进一步研究中进行探讨。
